After talking with Eake4, here's some notes y'all might want to know about:

NOTES:

-May not work with .wmv files-Filenames/Paths containing special symbols like Japanese characters or slashes cause problems-Will not work with non-pro versions of Vegas-If you are using the .mp4 container, Vegas Pro 10 has much better support than Vegas Pro 8-I advise using AutoClip with .avi files encoded losslessly with something like the Ut Video codec (420)